Hi list, This will be about recently added Delegate option. I think that it doesn't work as intended. I'll describe simple scenario which exhibits the problem.
Start qemu-kvm virtual machine via libvirt. libvirt will register vm with machined which in turn creates scope unit for vm and starts delegation of resource control for that scope (creates cgroups in all controller hierarchies). In my case qemu process has PID 1534, and indeed /proc/1534/cgroup indicates that cgroups where created in all controllers as expected and process was moved to them. 10:hugetlb:/ 9:perf_event:/machine.slice/machine-qemu\x2dvm1.scope 8:blkio:/machine.slice/machine-qemu\x2dvm1.scope 7:net_cls,net_prio:/machine.slice/machine-qemu\x2dvm1.scope 6:freezer:/machine.slice/machine-qemu\x2dvm1.scope 5:devices:/machine.slice/machine-qemu\x2dvm1.scope 4:memory:/machine.slice/machine-qemu\x2dvm1.scope 3:cpu,cpuacct:/machine.slice/machine-qemu\x2dvm1.scope/emulator 2:cpuset:/machine.slice/machine-qemu\x2dvm1.scope/emulator 1:name=systemd:/machine.slice/machine-qemu\x2dvm1.scope Next steps are reloading systemd and restarting some service. systemctl daemon-reload systemctl restart cups.service Now /proc/1534/cgroup contains following, 10:hugetlb:/ 9:perf_event:/machine.slice/machine-qemu\x2dvm1.scope 8:blkio:/machine.slice 7:net_cls,net_prio:/machine.slice/machine-qemu\x2dvm1.scope 6:freezer:/machine.slice/machine-qemu\x2dvm1.scope 5:devices:/machine.slice 4:memory:/machine.slice 3:cpu,cpuacct:/machine.slice 2:cpuset:/machine.slice/machine-qemu\x2dvm1.scope/emulator 1:name=systemd:/machine.slice/machine-qemu\x2dvm1.scope In some controller hierarchies process was moved out of the scope cgroup to machine.slice cgroup. However, scope cgroups in hierarchies still exist, for example, /sys/fs/cgroup/memory/machine.slice/machine-qemu\\x2dvm1.scope/ is present but doesn't contain any processes. Is this a bug in systemd or in my understanding of how delegation should work? Michal _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
